The Moon and Mars will share the same right ascension, with the Moon passing 5°03' to the south of Mars. The Moon will be 8 days old.

At around the same time, the two objects will also make a close approach, technically called an appulse.

From Cambridge , the pair will be visible in the evening sky, becoming accessible around 17:17 (EST), 61° above your southern horizon, as dusk fades to darkness. They will then reach their highest point in the sky at 17:53, 62° above your southern horizon. They will continue to be observable until around 23:51, when they sink below 10° above your western horizon.

The Moon will be at mag -11.9 in the constellation Cetus, and Mars at mag 0.2 in the neighbouring constellation of Aries.

The pair will be too widely separated to fit within the field of view of a telescope or pair of binoculars, but will be visible to the naked eye.

A graph of the angular separation between the Moon and Mars around the time of closest approach is available here.

The positions of the two objects at the moment of conjunction will be as follows:

The coordinates above are given in J2000.0. The pair will be at an angular separation of 93° from the Sun, which is in Capricornus at this time of year.

The sky on 21 Jan 2021

Source

The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

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Image credit

The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

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